i have an '83 305 sbc, edelbrock intake, headers and 550 cfm edelbrock carb. from cold start to hot engine, it is running rich with the smell of gas coming out of the exhaust w/ dark smoke. there is no return gas line from the carb.

i have adjusted the choke (electric) so that i know for sure that it is in the open position when the engine is hot, also i fiddeled around with the two idling screws on the carb, but they dont seem to take a big difference.

would the problem be that the 550 cfm carb is just too much for the little 305? i beleive that it has the stock cylinder heads/valvetrain and cam, would it be too much for this setup?

thanks